4I5R:
reference: Engineered thermostable fungal Cel6A and Cel7A cellobiohydrolases hydrolyze cellulose efficiently at elevated temperatures., Wu I, Arnold FH, Biotechnol Bioeng. 2013 Feb 12. doi: 10.1002/bit.24864. PMID: 23404363

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).